<template>
  <Transition
    :name="transitionName"
    @after-leave="destroyComponent"
    @enter="updateHeight"
  >
    <div
      class="vk-message"
      v-show="visible"
      :class="{
        [`vk-message--${type}`]: type,
        'is-close': showClose,
      }"
      role="alert"
      ref="messageRef"
      :style="cssStyle"
      @mouseenter="clearTimer"
      @mouseleave="startTimer"
    >
      <div class="vk-message__content">
        <slot>
          <RenderVnode :vNode="message" v-if="message" />
        </slot>
      </div>
      <div class="vk-message__close" v-if="showClose">
        <Icon @click.stop="visible = false" icon="xmark" />
      </div>
    </div>
  </Transition>
</template>
<script setup lang="ts">
import { ref, onMounted, computed } from 'vue';
import type { MessageProps } from './types';
import RenderVnode from '../Common/RenderVnode';
import Icon from '../Icon/Icon.vue';
import { getLastBottomOffset } from './method';
import useEventListener from '../../hooks/useEventListener';
const props = withDefaults(defineProps<MessageProps>(), {
  type: 'info',
  duration: 3000,
  offset: 20,
  transitionName: 'fade-up',
});
const visible = ref(false);
const messageRef = ref<HTMLDivElement>();
// const instance = getCurrentInstance()
// console.log('inner instance', instance)
// 计算偏移高度
// 这个 div 的高度
const height = ref(0);
// 上一个实例的最下面的坐标数字，第一个是 0
const lastOffset = computed(() => getLastBottomOffset(props.id));
// 这个元素应该使用的 top
const topOffset = computed(() => props.offset + lastOffset.value);
// 这个元素为下一个元素预留的 offset，也就是它最低端 bottom 的 值
const bottomOffset = computed(() => height.value + topOffset.value);
const cssStyle = computed(() => ({
  top: topOffset.value + 'px',
  zIndex: props.zIndex,
}));
let timer: any;
function startTimer() {
  if (props.duration === 0) return;
  timer = setTimeout(() => {
    visible.value = false;
  }, props.duration);
}
function clearTimer() {
  clearTimeout(timer);
}
onMounted(async () => {
  visible.value = true;
  startTimer();
  // await nextTick()
  // height.value = messageRef.value!.getBoundingClientRect().height
});
function keydown(e: Event) {
  const event = e as KeyboardEvent;
  if (event.code === 'Escape') {
    visible.value = false;
  }
}
useEventListener(document, 'keydown', keydown);
// watch(visible, (newValue) => {
//   if (!newValue) {
//     props.onDestory()
//   }
// })
function destroyComponent() {
  props.onDestory();
}
function updateHeight() {
  height.value = messageRef.value!.getBoundingClientRect().height;
}
defineExpose({
  bottomOffset,
  visible,
});
</script>
